How to set programmatically for differential thermocouple?

I'm trying to understand how a physical differential 'channel' (really a pair of channels) gets from a virtual channel. Specifically, I'm gaining of a thermocouple (K) using a differential connection.

In AIChannels.CreateAccelerometerChannel, for example, you can specify whether you want to create a differentiated channel. In the NOR-DAQmx help file, I see that for the M series (which I have), the differential negative physical channel number is 8 + the positive number. And he says "pass only the name of the positive channel" to the function create the differential [virtual] channel.

In AIChannels.CreateThermocoupleChannel there is no option to specify differential, single ended, etc. It is therefore impossible to use CreateThermocoupleChannel and connect the thermocouple to differential mode? In other words, do I have to create a channel of tension and then make the temperature conversion myself?

Hi pelesl.

Most of the parameters for methods of creating DAQmx channel is used to set properties on the newly created channels. You can also get or set the same properties yourself. The terminal configuration parameter in the method of creating channels voltage corresponds to the TerminalConfiguration property, so you should be able to do something like this:

AIChannel chan = task. AIChannels.CreateThermocoupleChannel (...);

Chan. TerminalConfiguration = AITerminalConfiguration.Differential;

Brad

Tags: NI Software

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